kernel oops - unable to handle kernel NULL pointer dereference; probe_monitoring_device / nouveau_i2c_identify

[jrr]

Jan 16 17:58:34 asdf-linux kernel: [ 8.158262] BUG: unable to handle kernel NULL pointer dereference at 00000000000000fc
Jan 16 17:58:34 asdf-linux kernel: [ 8.158367] IP: [<ffffffffa02699f8>] probe_monitoring_device+0xb8/0xf0 [nouveau]
Jan 16 17:58:34 asdf-linux kernel: [ 8.158466] PGD cad47067 PUD cad48067 PMD 0
Jan 16 17:58:34 asdf-linux kernel: [ 8.158598] Oops: 0000 [#1] SMP

...

Jan 16 17:58:34 asdf-linux kernel: [ 8.160001] Call Trace:
Jan 16 17:58:34 asdf-linux kernel: [ 8.160001] [<ffffffffa0261ee8>] nouveau_i2c_identify+0x108/0x230 [nouveau]
Jan 16 17:58:34 asdf-linux kernel: [ 8.160001] [<ffffffffa0269ba2>] nouveau_therm_ic_ctor+0x172/0x180 [nouveau]
Jan 16 17:58:34 asdf-linux kernel: [ 8.160001] [<ffffffffa023c59c>] ? therm_table+0x10c/0x150 [nouveau]

...

(full log attached)

[jrr (johnruble)]

this was from today's ubuntu-gnome trusty amd64 image, by the way: http://cdimage.ubuntu.com/ubuntu-gnome/daily-live/current/

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1269986

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[jrr (johnruble)]

I can't run apport on the system in question as it fails to boot. I can grab additional logs from the filesystem if there's any specific requests.

[Joseph Salisbury (jsalisbury)]

Can you follow the "Boot options" instructions on the following wiki to enable additional output on boot:

https://wiki.ubuntu.com/DebuggingKernelBoot

As mentioned on the wiki, it would be great if you can attach a log file which may have captured any messages you see. If you are unable to capture a log file, a digital photo will work just as well. As a last resort you can even copy messages down by hand.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v3.13 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.13-rc8-trusty/

[jrr (johnruble)]

I didn't even have to go that far! This was fortuitous: apt upgrading from 3.13.0-3-generic to 3.13.0-4-generic has fixed it! Nouveau loads and works.

Need anything else from me before closing?

[penalvch (penalvch)]

jrr, this bug report is being closed due to your last comment https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1269986/comments/7 regarding this being fixed with an update. For future reference you can manage the status of your own bugs by clicking on the current status in the yellow line and then choosing a new status in the revealed drop down box. You can learn more about bug statuses at https://wiki.ubuntu.com/Bugs/Status. Thank you again for taking the time to report this bug and helping to make Ubuntu better. Please submit any future bugs you may find.